Abstract
Shape-controlled silver nanoparticles (Ag NPs) were prepared in a well-dispersed mode on the active imprinting sites of chitosan-TiO 2 adsorbent (CTA) by means of bioaffinity adsorption and TiO 2 photocatalysis. Nontoxic hydrogen peroxide (H 2O 2) was used as a suitable etching reagent in our production of shape-controlled Ag NPs, since it could regulate the TiO 2 photocatalysis and accelerate the generation of O 2. With the same amount of H 2O 2 addition, silver nanocubes, nanospheres and truncated triangular nanoplates were individually obtained on the surface of CTA under UV irradiation by facilely adjusting the initial Ag + concentration. The FE-SEM, XRD and UV–visible characterizations confirmed single crystal Ag NPs with different shapes loaded on CTA. The mechanism for the formation of shape-controlled Ag NPs was discussed based on a photocatalytic reaction system. As an example of applications of the Ag NPs, we tested the biocidal properties, and silver nanocubes exhibited the highest antibacterial activity. Our research provided a simple synthesis for shape-regulated Ag NPs steadily loaded on CTA. It might moreover be a guide in preparing metal nanocrystals monodispersely immobilized on chemical substrates.
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